Step $1$: First determine $"n"$ using the abbreviated formula: $(\frac{1}{2}{)}^n=\frac{1}{16}.$ In other words, how many times do you have to multiply a $"1/2"$ by itself to get $"\frac{1}{16}?"$ Observe carefully: $\frac{1}{16}=\frac{1}{2}\frac{1}{2}\frac{1}{2}\frac{1}{2}.$ Therefore, $n=4!$ Step $2$: Multiply the half$-$life $(5,700)$ by $)=(44$ half$-$lives $5700$ years$/$half$-$life $=22,800$ years. $($That is very young for a fossil!!$)11$ Now it is your turn... a$.$ The amount of $C-14$ in